Reservoir pen



H. OKAD RESERVOIR PEN Nov. 13, 1934.

Filed April 4, 1934 7 70K/KEY Patented Nov". 13,1934 Y' RESERVOIR PEN Hiroshi Okada, Tokyo, Japan Application April 4, 1934, serial No. 'ziaou In Jem August so, i933 (enzo- 41) v 'rms invention relates te self-mung reservoir pens of the type comprising a -pi'ston adapted to be reciprocatedv within the pen barrel by means of a rod s0 that ink is drawn into the barrel von the outward stroke and passed to the other side of the pistn-during the instroke.

Theobjects of the invention are to providev an improved construction of the above-mentioned type and to provide a pen which is leak-proof.

Recording to this invention, the piston comprises an annulus or ring which is loosely mounted on an enlargement of the piston rod and capable of axial movement thereon between two stops,`

movement of the said annulus being effected by its engagement or contact with the wall of the barrel to -allow ink to pass from one side of the annulus to the other.

ink passage m.

' "After the been pulled up to its full` vThe enlargement of the said piston rod may becone-sha'ped to iit into a correspondingly shaped recess in the ink passage to the nib.

` In order that the invention may be understood,

it will new be described with reference. te the accompanying drawing in which Figure 1-is a4 longitudinal section o1 one form of pen constructed in accordance Awith this invention; Figure 2 is a similar'v viewto Figure 1, but showing the pist0n in another position; Figure 3 'a detail view; Figure 1 is a sectional elevation of anotherV4 form of pen constructed in accordance with this invention; Figure 5 is a view to Figure 4 but showingthe.piston in', a dierent position; Figure 6 is a detail view and Figure 'I is a perspective viewlof the piston ring.

Referring rst to Figures 1 to 3 inclusive, the pen comprises a barrel a to which is screwed a pen cap b and a knob c. Inside the barrel a is iitted an india-rubber or bag d. e vis a piston rod ttedin the knob c.

The other end ofthe rod e 1s provided withan enlargement flon'which is loosely mounted an annulus'or ring g. Axial movement of the said annulusis limited between the stops h and g. The end of the enlargement f is cone-shaped at 1c to rit into a correspondingly shaped recess 1 in the 11n order to fm tne'pen, me mb is placed into Y the ink, andthe knob c Ais unscrewed and the rod.

is gradually pulled out. By doing this, the anlnulus y, when it contacts with the lining d will imtil it abuts against the stop i. barrel will escape; through the rod has extent, itis then annulus y moved axially until pushed in and in doing so the it abuts4 against Auntil the annulus g passes the lining d annulus or ring g'.

the stop h and closes theoutlet n. On further f movement, a vacuum .is created inthe barrel when the ink' passes into the barrel. y 2 When the knob4 c is screwedA dwn,.as seen in Figure 1, the cone k enters thecrecess l andseals the end passage m thus the pen leakproof. i

Referring now to Figures .4 to '7, inclusive, the construction of the pen issimnar te that must trated in Figures 1 to 3, with the exception that the enlargement f of the rod is a diierent shape and the annulus g is tiltable, as well as being capable of axial movement. The enlargement f' of the rod e is formed, with a neck p of smaller '(7,0

diameter and on the neck is loosely mounted the As seen in Figure '1,.t`he said annulus is formed with two diametrically opposite lugs o, o, adapted to coact with the stop h when the annulus travels 175. up thereagainst and cause Ythe annulus to tilt.

In order to -ll this pen, the nib is placed in the ink, and the knob c is unscrewed, and the rod is gradually pulled out. By doing Athis the annulus g' when it contacts with the lining d will;80 move axially until it abuts against'the head k annulus g'passes the lining .d when the -Q passes into the barrel.

What I claim isz- 1. A self-iilling reservoir- -pen comprising a barrel havingfa restricted portion therein, a lining of india-rubber in said restricted portion, a screw cap carrying the nib at one end and 4a screw knob at the other and axially reciprocable' means disposed inside said barrel. said means comprising a rod connected at'one end to Asaid knobl and -having at its other'end an enlargef100 ment, a iixed flange and .a stop spaced apart on. said enlargement and an annulus loosely mounted on said enlargement and disposed between l said flange and stop such that when the said 105 rod is reciprocated in said barrel and thean-l y nulus contacts with Vthe lining in theresti'lcted portion thereof there isrelative movement be- `tween the. annulusjand the enlargement; the nxed me serving es a conol to regulate the' m ment, a ilxed ange and a stop spaced apart on safd enlargement and an annulus loosely mounted on safd enlargement'anddisposed between said flange and stop, two diametrically opposite lugs on said annulus, such that when the said rod is reciprocated in said barrel and the annulus contacts with the lining in the restricted portion` thereof there is relative movement between the annulus andthe enlargement until .the said lugs strike against the xed ange and tilt the said annulus thus allowing air to pass between the annulus and the lining of the barrel. `l

'HIROSHI oKADA. 

